Stand age and precipitation affect deep soil water depletion of economical forest in the loess area

Tao, Ze; Li, Hongchen; Cheng, Bing

doi:10.1016/j.agrformet.2021.108636

Cited by 20 publications

(9 citation statements)

References 54 publications

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“…However, few studies have determined the soil layer depths from which trees derive their water source when calculating the contribution of water sources based on the natural abundance of stable isotopes method. Numerous studies have determined this depth based on prior information (e.g., vertical root distribution) (Tao et al, 2021b;Wu et al, 2022;, which can reach 5 m to even 10 m. The existence of roots in deep soils does not necessarily mean that root water uptake occurs (Szutu and Papuga, 2019). The isotopic labeling results showed that no water uptake occurred in deep (>140 cm) soils for 11-year-old apple trees during the FSW stage (Fig.…”

Section: Discussionmentioning

confidence: 99%

“…A CVD system (Li-2000; LICA United Technology Limited, Beijing, China) was used to extract water under a heating temperature of 95 • C and a pressure of 0.2 Pa, which has been applied in previous studies (Huo et al, 2020;Tao et al, 2021a;Wang et al, 2021b;Zhao et al, 2020). The extraction time of soil water and xylem water samples were 90 and 120 min, respectively.…”

Section: Isotopic Analysismentioning

confidence: 99%

“…Numerous evidence from various ecosystems suggests that trees can adjust their water sources to adapt to changes in the surrounding water environment (Barbeta et al, 2015;Gao et al, 2018a;Ma et al, 2021;. In DVZ regions such as the Loess Plateau, soil water from precipitation is the primary water source for plant transpiration (Gao et al, 2021a;Tao et al, 2021a;Wu et al, 2022). Severe drought and water shortages and intense seasonal precipitation variation result in complicated and volatile soil water environments in this region.…”

Section: Differences In Water Sources During the Growing Season And B...mentioning

confidence: 99%

“…However, it is challenging to quantify where in the soil profile the roots extract water due to limitations in monitoring technologies and unclear physical processes such as preferential flow (Xiang et al, 2019;Zarebanadkouki et al, 2013). Furthermore, most studies using the natural abundance of stable isotopes method usually assumed soil water utilization at specific depths based on vertical root distribution (Huo et al, 2018;Tao et al, 2021b;Wu et al, 2022;Zhao et al, 2020), which may incorrectly quantify the contribution of different water sources, especially for DLSW.…”

Section: Introductionmentioning

confidence: 99%

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The natural abundance of stable water isotopes method may overestimate deep-layer soil water use by trees

Wang

Gao

Yang

et al. 2023

Hydrol. Earth Syst. Sci.

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Abstract. Stable water isotopes have been used extensively to study the water use strategy of plants in various ecosystems. In deep vadose zone (DVZ) regions, the rooting depth of trees can reach several meters to tens of meters. However, the existence of roots in deep soils does not necessarily mean the occurrence of root water uptake, which usually occurs at a particular time during the growing season. Therefore, quantifying the contribution of deep-layer soil water (DLSW) in DVZ regions using the natural abundance of stable water isotopes may not be accurate because this method assumes that trees always extract shallow- and deep-layer soil water. We propose a multi-step method for addressing this issue. First, isotopic labeling in deep layers identifies whether trees absorb DLSW and determines the soil layer depths from which trees derive their water source. Next, we calculate water sources based on the natural abundance of stable isotopes in the soil layer determined above to quantify the water use strategy of trees. We also compared the results with the natural abundance of stable water isotopes method. The 11- and 17-year-old apple trees were taken as examples for analyses on China's Loess Plateau. Isotopic labeling showed that the water uptake depth of 11-year-old apple trees reached 300 cm in the blossom and young fruit (BYF) stage and only 100 cm in the fruit swelling (FSW) stage, whereas 17-year-old trees always consumed water from the 0–320 cm soil layer. Overall, apple trees absorbed the most water from deep soils (>140 cm) during the BYF stage, and 17-year-old trees consumed more water in these layers than 11-year-old trees throughout the growing season. In addition, the natural abundance of stable water isotopes method overestimated the contribution of DLSW, especially in the 320–500 cm soil layer. Our findings highlight that determining the occurrence of root water uptake in deep soils helps to quantify the water use strategy of trees in DVZ regions.

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Section: Discussionmentioning

confidence: 99%

Section: Isotopic Analysismentioning

confidence: 99%

Section: Differences In Water Sources During the Growing Season And B...mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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The natural abundance of stable water isotopes method may overestimate deep-layer soil water use by trees

Wang

Gao

Yang

et al. 2023

Hydrol. Earth Syst. Sci.

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“…Soil water content is influenced by vegetation both indirectly by precipitation interception and directly by using water for transpiration (Špulák et al, 2021). Therefore, infiltration and consequently soil moisture conditions are related to various types and characteristics of vegetation (Tao et al, 2021;Yang et al, 2018). In this context, Rahman et al (2019) investigated soil infiltration potential under the canopies of two different urban tree species, namely Robinia pseudoacacia and Tilia cordata near two streets in Munich, Germany.…”

Section: Introductionmentioning

confidence: 99%

Temporal response of urban soil water content in relation to the rainfall and throughfall dynamics in the open and below the trees

Zabret

Sapač

Šraj

2023

Journal of Hydrology and Hydromechanics

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Rainfall interception process is an important part of the biohydrological cycle, in which vegetation plays an important role by regulating the amount and dynamics of rainfall reaching the ground. In this paper, an event-based analysis is performed to discuss the influence of vegetation on dynamic of temporal response of soil volumetric water content (VWC) in the upper soil layer during rainfall events. More specifically, six events that occurred between 19 November 2021 and 30 June 2022, characterized by different hydro-meteorological and vegetation conditions, are analyzed based on continuous measurements of VWC in the open and below groups of two deciduous (Betula pendula Roth.) and two coniferous trees (Pinus nigra Arnold), as well as rainfall in the open and throughfall on an urban experimental plot in Ljubljana, Slovenia. VWC values at the upper depth (16 cm) were the highest under the birch tree, followed by the location in the open and under the pine tree. However, in the lowest depth (74 cm) VWC values were the lowest under the birch tree. VWC responses to rainfall and throughfall showed seasonal patterns related to the pre-event wetness conditions, with a faster occurrence of maximum VWC values in the leafless period. Additionally, rainfall amount and its dynamics during the event significantly affect the response, as VWC in general reaches its peak after the occurrence of more intense rainfall. Such an event-based analysis, offering an insight into the dynamics of the event development, is crucial and very beneficial for understanding of the biohydrological processes.

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Matching root water uptake patterns to fine root and soil water distributions

Zhu,

Zhao,

et al. 2023

Plant Soil

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Exploring the relationships between water uptake, ne root, and soil water is essential for many elds, such as plant physiology, ecological hydrology, and water conservancy. MethodsIn four Populus tomentosa stands with different ages (young and mature) and stand structures (low and high stand density), we matched root water uptake patterns obtained from stable isotope techniques with ne root and soil water distributions, respectively. The effects of soil water content and meteorological factors on these matching degrees were further explored. ResultsIt was found that the water uptake pattern was closer to soil water distribution than to ne root distribution in mature stands, while water uptake pattern matched both ne root and soil water distribution closely in young stands. Increased competition intensity within a stand would suppress the matching degree between water uptake patterns and ne root distribution, but would have little effect on the matching degree between water uptake patterns and soil water distribution. There is a relatively high positive or negative correlation between these two matching degrees in all four stands. Compared with the direct effect of soil water content, the in uence of meteorological factors on matching degrees was relatively weak. ConclusionThe results indicate that the expression of water uptake function of the young stand depends on a combination of root structure and available water resources, while the water uptake function of mature stands is driven more by available water resources rather than root structure.Therefore, the relationships between root water uptake, spatial root distribution, and soil water have been the subject of concern in many elds such as plant physiology, ecohydrology, and water conservancy

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Stand age and precipitation affect deep soil water depletion of economical forest in the loess area

Cited by 20 publications

References 54 publications

The natural abundance of stable water isotopes method may overestimate deep-layer soil water use by trees

The natural abundance of stable water isotopes method may overestimate deep-layer soil water use by trees

Temporal response of urban soil water content in relation to the rainfall and throughfall dynamics in the open and below the trees

Matching root water uptake patterns to fine root and soil water distributions

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